South African Immigration deporting Nigerians for flimsy excuses

For a while now the South African immigration have been deporting Nigerians for the flimsiest reasons. Starting from their airport, they deport you for allegedly carrying what they call 'fake' yellow card. Then sometimes they raid local hotels and even pick Nigerians up while they are going about their business. Today Friday Feb. 28th they deported eleven Nigerians for hotel reservation reasons. The ones staying at apartments too were deported because according to South African immigration, their names didn't appear on the apartment lease while clearly they were just guests.
Why are they doing this? Our government needs to do something about this ASAP. This is not cool!